491011111201 has 32 divisors (see below), whose sum is σ = 561721724928. Its totient is φ = 426056578560.

The previous prime is 491011111187. The next prime is 491011111207. The reversal of 491011111201 is 102111110194.

It is a cyclic number.

It is not a de Polignac number, because 491011111201 - 2³⁵ = 456651372833 is a prime.

It is a super-2 number, since 2×491011111201² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491011111207) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1910400 + ... + 2152126.

It is an arithmetic number, because the mean of its divisors is an integer number (17553803904).

Almost surely, 2^491011111201 is an apocalyptic number.

491011111201 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

491011111201 is a deficient number, since it is larger than the sum of its proper divisors (70710613727).

491011111201 is a wasteful number, since it uses less digits than its factorization.

491011111201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241921.

The product of its (nonzero) digits is 72, while the sum is 22.

Adding to 491011111201 its reverse (102111110194), we get a palindrome (593122221395).

The spelling of 491011111201 in words is "four hundred ninety-one billion, eleven million, one hundred eleven thousand, two hundred one".